Attachment for boilers



L nf. gw A .0 W

June 5, 1928.

R. E. GRVEY ATTACHMENT'FOR BOILERS Filed July 28, 1926 f elevation'.

yinputted James, loza y -of the'invention "adapted to -vent radiationtherefrom before the flue line 3-3of Figure 1, and, l

mit the ilues ofthe furnape usual damper 15.

f UNITED STATE Y narxonn r. calm, or treinen,

arracnm'r' application lied Ialy 88,

This invention relates to heating systems and more particularly toanattachment for boilers. 4

Broadly speaking it is an important obJect to provide means forutilizing the heat of the products ofcombustionl and flue gases forAheating the boiler and to utilize the products` of combustion and fluegases for preventing" radiation of heat from the-boiler.

A further object is to provide a casing esurround a portion of a'boiler`and provided with passages through which the products of combustion andflue gases are adapted to dow in contact with Vthe boiler. before passinout through th stack.

A further o ject is to provide a heat insu lating casing surrounding'lai portion of a boiler and provided at its sides with relatively narrowdeep passages for the flue gases whereby the latter are held in closeroxi'mty to the boiler to heat the latter an pregases ass to the stack.A rther object is to provide a-device of the above mentioned characterrovided with suitable dempers for contro the passage of the gases.vOther objects and advantages'of the invention will become apparentduring the course of the following description.

In the drawings I have shown one embodiment of the invention.'- In thisshowing: Fi 're 1 is a sideelevation of a boiler *showing thedeviceapplied, parts being broken away,

Filgure 2 's a.' section online 2-2 of F ig ure i Figure' 3 is a sectiontaken on 'Figure 4 is a hmm une 4 4 of. Figure 1, the 'furnace Referringto t 'e numeral 10 d ates an ordinary ly oft e oi or-gasburnin'g furnaceis provi ed" its front end with ja 13 of the usual type 'also areproridedtn i tn be The furnace is provided with a ta orout-Y iecpipe 14sdapdube by Innerand outer A `16 anilllA surround `the top, sidesandfur-3 -the casing toda Vthe stack the space between the plates '25and26, reap' Dampers.v 31* of dampers are 'adapted pitdoor12.

ron.' nomina im. semi n. uam

shown' .in Figures 2 and 4. The ca sings 16 and 17 form in effect asingle'casing having parallel walls slightly spaced, and t i may beutilized either `as a dead air space or may as indicated at 18. The.forward end of s space l be iilledwith Vheat insulating mater'l casingis provided with an inward-ly extending .wall 19 snugly fitting againstthe sides of the.furnace adjacent the front -thereof whereby the latterisaccessible in the usual manner for firing the boiler'oi' furnace. At

the sides of the furnace a relatively narrow passage 19 isprovided'inwardly of the casing, and this passage extends throu hout theheight of the furnace. Rearward y of the furnace. a relatively deepspace 20- is provided. This space communicates with an outlet pipe 21closed at its'outer end by a cap 22. A branch pipe 23 connects the pipes21 and 14 and may be controlled by a suitable dam r24.

(Inwar ly of the casing, a'hor'izontal plate Y25 surrounds the 'furnaceadjacent the' top thereof, and below the plate 25 another plate o'rpartition 26 extends from the reartend of w'ard end thereof as indicatedat 27 whereby the passage 19" is divided into vpassagesor for a purposeto be described. v As shown in Figure 3; the plates 25' and 26 ilues28'and 29 extend from the back of thefurnaceto the back wall of thecasing.

Y Means are provided for permitting the flue gases to pass into thepassa 28 instead of passing directly tothestac For this branch pipes 30areconnected 14 and extend into opposite vsides of wardly of thefurnace.

through c ontroal0 thei Y e Il t by haliridl 'or 32.' i

' wn in igure 2 e p tends from plate 23th the floor line,

clean-out o" nings 33 Aare provided in the casing and adapted-'to beclosed by covers 34.

point spaced vfrom the'for.-

with

Y' The operation o'f the `device is 'as follows; Y'

As previously stated,; the attachment is particularly .adapted .for usein connect-ion with heating f plants employing oil orf'gas -burning equinient but" is necessarily the as su operation,

use. When furnace is in the. damper 15 may closed,'and the `daxnperslopened. The' products of combustion will flow the pipes 8 0 tothewwrtiensvfthemmd 5 downwardly into the lower passage 29, to

the .rear portionof the passage 29, and,

as will vbe obvious.

thence forwardly through the sides of these passages as indicated bythe-arrows in Fig- ,ures 2 and 3. When the forward end 27 of .thepartition 26 is reached, the gases flow thence to the stack throughpipes 21 and 23,

it being understood that the damper 24 is4 sistance thereto, whereby thetire may be'` forced in the usual manner when the damper 24'is opened topermit complete combustion to take place; It will be obvious however,that the dampers 3 1 may be closed and the damper` 15 opened to permitthe furnace to be operated in the usual manner. Accumulations of solidmatter may be removed from the casing by removing the covers34 From theforegoing it .Will be apparent-that the presence of the gases inproximity to the -furnace ytends to prevent the ra/diation of heattherefrom.

while the heat of the products of combustion, which is ordinarily wastedis employed to assist in heating the water in the boiler. Radiation ofheat also is minimized owing to the use of the insulating material 18,but it has been found that thev provisionA of a dead airspace betweenthe inner and' puter casings also 'provides excellent results in'thisconnection. Y' lIt is to be understood that the form of the inventionherewith shown Iand described is to be taken as a preferred example ofthe same and that various changes in the shape, size and arrangementofparts may be resorted to without departing from the spirit of 'theinvention or the scope of the subjoined claim.

I claim: l The combination with a boiler having an outlet opening and aflue, of a casing surrounding a portion of the boiler and provided witha passage arranged in proximity to a portion of the boiler, branchconduits connecting said outlet with one end of said passage at oppositesides of said boiler, the opposite end of said passage being connectedtol said flue, and dam'pers in each of said branch conduits forselectively regulating the flow of gases to each side of said boiler.I0.

` In testimony whereof Isaflix my signature.

RAYMOND E. GARVEY.

